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Sieve analysis of aggregate is to determine the particle size distribution of various sizes and hence to determine the zoning of the aggregates based on the gradation curve plotted.

SW- clean well graded sand,
SP- poorly graded sand, SC- well graded sand with clayey soils

Reversible adiabatic process is called Isentropic process. A carnot cycle consists of two isothermal and two isentropic processes.

The effective stress is reduced due to upward movement of flow of water. When the head causing upward flow is increased, a stage is reached when the effective stress is reduced to zero.
The condition so developed is known as quick sand condition.
Quick sand is not a type of sand or soil but a flow condition (hydraulic condition) occurring in cohesionless soils.
The discharge required to maintain a quick condition in a soil increases as the permeability of the soil increases.

In this method of estimation, the total center line length of walls in a building is first calculated, then the center line length is multiplied with the breadth and depth of respective item to get the total quantity at a time.

BLDC is Similar to AC synchronous motor

Maximum efficiency occurs at 80% of rated load, thus 80% of 5 kw = 4 kw

since excitation is removed its works as motor for salient pole synchronous generator

To measure core loss with min error LPF wattmeter is used in OC test if UPF wattmeter is used to measure then the error is too high .

The permissible value of pH in potable water is 7 to 8.5. pH determines the acidity and basicity of the fluid. It is defined as the logarithm of H ions generated in the fluid.

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